title: [Kidney function in the newborn infant of 32 to 36 weeks gestation: the usefulness of the excreted sodium fraction].
abstract: A total of 20 healthy premature newborns, with a gestational age between 32 and 36 weeks were studied for a year. The objective of the study was to determine the utility of the excreted sodium excretion fraction test (FENa) as a parameter used to evaluate renal function in this type of patients, using comparatively the excretion of creatinine. Of the patients studied, 12 were females and the rest males; the medium gestational age was 35.1 weeks (ranging from 32 to 36 weeks); their average weight at birth was 1,943 g (ranging from 1,372 to 2,626 g); serum creatinine varied from 0.3 to 1.2 mg/dL; urinary sodium was measured at 5.37 and 38 mEg/L; the excretion of creatinine was measured at 8.26 +/- 5.18 mL/min/1.73 m2. The FENa varied between 0.1 and 1.71% (x = 0.78 +/- 0.48). The results obtained showed that the FENa is a useful parameter to evaluate renal function in premature newborns with a gestational age between 32 and 36 weeks.
authors.affiliation: Departamento de Pediatría, Hospital General Dr. Manuel Gea González, México, D.F.
authors.forename: E
authors.initials: E
authors.lastname: Escobedo-Chávez
authors.forename: R
authors.initials: R
authors.lastname: Carvallo-Herrada
authors.forename: O
authors.initials: O
authors.lastname: Thompson-Chagoyan
authors.forename: S
authors.initials: S
authors.lastname: Ortega-Guzmán
mesh_terms: D003404:Creatinine / Q000097:blood / Q000652:urine; D005260:Female; D005500:Follow-Up Studies; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature / Q000502:physiology*; D007668:Kidney / Q000502:physiology*; D008297:Male; D012964:Sodium / Q000097:blood / Q000652:urine*
chemical_list: D012964:Sodium; D003404:Creatinine
vernacular_title: Función renal en el recién nacido de 32 a 36 semanas de gestación: utilidad de la FENa.